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built a box to add a sub under the backseat

built a box to add a sub under the backseat

Postby CorNut [OP] » Nov 05 2019, 11:26pm

I finished this about a year ago but apparently I didn't share the finished product. It sounds great, it's much louder than you'd expect from a single 10. I was able to tune it to 35hz with adequate airspace. Originally, I was planning to install a 12 but unfortunately I couldn't get the proper airspace & tuning regardless of what I tried.

I'm posting a few pics so you can see the progression of the build. For mids and highs I went with 6.5" Kappa separates up front and 6.5" Kappa coax's in the back. The DSP is a DSR1 that gets its signal from a PAC AmpPro AP4-GM61 which hooks up to the factory radio so I retain all stock functions with an adjustable door chime/back up sensor. The AmpPro says it's only compatible with the Bose setup but that's not true, if you have a non Bose RPO (mine's IO6 & UQ3) you'll need to flip switch #3 on the unit to sum (you'll lose stereo sound) your signal for AM/FM/XM. This won't sum your signal when playing things over Bluetooth/Android Auto/Carplay/CD, you'll retain stereo sound for those applications.

My amp is a 5-channel Rockford T1000X5AD that pushes the mids and an RE Audio SL-10 sub. I built an ABS amp rack that props it and the DSP up behind the seat utilizing the jack handle's mount. With this setup, I have enough room to still store (hidden) my jack, cargo straps, tow hitch and tire chains. I know this isn't for everybody, my storage capacity is maxed out now but I still have enough room for my essentials.
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Last edited by CorNut on Nov 05 2019, 11:31pm, edited 1 time in total.
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Re: built a box to add a sub under the backseat

Postby roorancher » Nov 05 2019, 11:30pm

Nice work!
Not my thing....but I do like the color of your truck!!! LOL!
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Re: built a box to add a sub under the backseat

Postby CorNut [OP] » Nov 05 2019, 11:44pm

roorancher wrote:Nice work!
Not my thing....but I do like the color of your truck!!! LOL!


Thanks!
I know it's not something you see most full size pickup owners do but I'm one of those that do. It was a lot of work trying to do it in a way that kept a factory look (important to me) and allowing me to still store a few things. It amazes people the amount of sound it produces, it's unexpected since it's hidden to an untrained eye.
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Re: built a box to add a sub under the backseat

Postby MacQ » Nov 06 2019, 12:31am

Not bad. At least you seem to have a clue, as you mentioned tuning the box to 35hz and airspace. I get a kick out of those who purchase an expensive (and often large) subwoofer and haven't a clue how to tune and port a cabinet. They just shove it into a recommended cubic foot cabinet and and hit it with max amps.
Good job!
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Re: built a box to add a sub under the backseat

Postby dav2no1 » Nov 06 2019, 2:43am

Looks good...
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Re: built a box to add a sub under the backseat

Postby plant.one » Nov 07 2019, 7:43am

you put some time into that box. nicely done!
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Re: built a box to add a sub under the backseat

Postby CorNut [OP] » Nov 08 2019, 3:07pm

plant.one wrote:you put some time into that box. nicely done!


This box was my first time kerfing wood. I failed twice before getting the right depth. The first time I cut too deep & had to throw it out, the second attempt wasn't deep enough and the resistance while folding ended up breaking it.

Now that it's done it's basically a fiberglass box with an MDF mold. It was fragile until I filled the cracks with resin, followed by 4 layers (entire interior) of fiberglass but now it's indestructible. After mounting/gluing the baffle on the box I reached in and did a couple layers of fiberglass everywhere I could reach and another layer along the outer seam prior to carpeting to make sure there's no chance of air leaks.

I put some time into it but I'm happy with the finished product.
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Re: built a box to add a sub under the backseat

Postby Bradley21sanders » Nov 08 2019, 3:20pm

MacQ wrote:Not bad. At least you seem to have a clue, as you mentioned tuning the box to 35hz and airspace. I get a kick out of those who purchase an expensive (and often large) subwoofer and haven't a clue how to tune and port a cabinet. They just shove it into a recommended cubic foot cabinet and and hit it with max amps.
Good job!


That sounds like something I would do.. that's why I haven't done it yet. Ha one of these days I will get the two 10s under the back seat and all new speakers

Good work CorNut! If you can get a good quality video you should share with us
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Re: built a box to add a sub under the backseat

Postby CorNut [OP] » Dec 01 2019, 1:49am

Bradley21sanders wrote:If you can get a good quality video you should share with us


Are you talking a visual video or how it sounds? I took a few videos tonight and they all sound like garbage over the mic. When listening to metal, my typical music, instead of bass guitar & drum sound it drowns the mids and highs to the point they sound nonexistent. I tried bass music but it sounds distorted and rap is a mix between the 2 but you can't really hear the bass. In person it sounds amazing but I can't get it to translate to a video well.
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Re: built a box to add a sub under the backseat

Postby Contra » Dec 01 2019, 2:14am

Very nice work.
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